
package com.bstek.urule.parse;

import com.bstek.urule.model.rule.lhs.Criterion;
import org.dom4j.Element;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * @author Jacky.gao
 * @since 2014年12月23日
 */
public abstract class CriterionParser extends AbstractParser<Criterion> implements ApplicationContextAware {
    protected Collection<CriterionParser> criterionParsers;

    protected List<Criterion> parseCriterion(Element element) {
        List<Criterion> list = null;
        for (Object obj : element.elements()) {
            if (obj == null || !(obj instanceof Element)) {
                continue;
            }
            Element ele = (Element) obj;
            String name = ele.getName();
            for (CriterionParser parser : criterionParsers) {
                if (parser.support(name)) {
                    if (list == null) list = new ArrayList<Criterion>();
                    Criterion criterion = parser.parse(ele);
                    if (criterion != null) {
                        list.add(criterion);
                    }
                    break;
                }
            }
        }
        return list;
    }

    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        criterionParsers = applicationContext.getBeansOfType(CriterionParser.class).values();
    }
}
